Tax Planning for Small and Solo Law Firms

A small or solo law firm carries one obligation that overrides almost every other bookkeeping and tax question: client trust funds, IOLTA or a similar trust account, are never, under any circumstances, the firm's money, and treating them as available cash even briefly is both an ethical violation and a bookkeeping error that can unravel a firm's finances fast.

Trust accounting discipline has to be airtight before anything else gets built on top of it. Client funds held in trust, retainers not yet earned, settlement proceeds awaiting disbursement, sit in a segregated account, reconciled regularly against a client-by-client ledger, completely separate from the firm's operating account. A firm whose bookkeeper or accountant isn't explicitly tracking trust balances separately from firm revenue is one honest mistake away from a serious problem, not just a technical one.

Entity structure for a law practice typically starts with a state bar requirement rather than a free choice, a professional limited liability company or professional corporation, the specific form dictated by the state's rules for a licensed legal practice. Within that structure, the S-corp election question follows the same self-employment tax logic as any other pass-through business once profit clears the point where the tax savings outweigh the cost of running payroll, the professional-entity requirement sits on top of that standard analysis rather than replacing it.

Contingency fee revenue recognition timing is a genuinely firm-specific issue. Fee income from a contingency matter generally isn't recognized until the case resolves and the fee is actually earned and collectible, not when the case is filed, and not based on an optimistic estimate of eventual recovery. A firm with several contingency matters in progress at once needs revenue recognition that reflects that reality, not a smoothed estimate that makes monthly numbers easier to read but less accurate.

Reasonable compensation for partner-level S-corp owners draws real scrutiny, and law firm income is unusually well-documented for benchmarking purposes, state bar salary surveys and practice-area compensation data give a clear comparability picture that cuts both ways. A partner compensation figure set once at formation and never revisited as billings grow is a common and avoidable weak point in an S-corp election; documenting the annual compensation decision, with the comparability data behind it, is what makes the number defensible.

Retirement plan capacity is frequently underused by partners in their highest-earning years. A standard 401(k) shelters meaningfully less than many partners could actually contribute on a tax-deferred basis, layering a cash balance or defined benefit plan on top allows substantially higher contribution limits for a partner closer to retirement, though these plans generally require covering eligible staff too and carry real actuarial complexity worth modeling against the firm's actual headcount.

Referral fees, co-counsel arrangements, and of-counsel relationships each carry their own 1099 and revenue-sharing documentation requirements that are easy to handle inconsistently across different matters without a clear firm-wide policy for how they get recorded.

OICPA works with small and solo law firms on trust accounting oversight, contingency fee revenue recognition, and reasonable compensation documentation for partner-owners that holds up to comparability scrutiny.